Why does the speaker appear in the notebook computer

Many kinds of situations will cause the computer to have a noise, such as the sound box is disturbed, the interface or the connection line contact is bad, the sound quality is poor, etc..   

Generally speaking, the computer audio is more active speakers, there will be an internal amplifier, so the noise is inevitable, active speaker of the noise sources can be divided into electromagnetic interference, mechanical noise and thermal noise, etc..

The electromagnetic interference can be divided into the power transformer and the stray electromagnetic interference. Generally speaking, power supply transformer interference is due to the power leakage of the multimedia speaker, in the case of the case for the installation of the transformer is very clear, can be the greatest degree of leakage magnetic barrier, shielding cover can only be made of iron type material. We should try to choose the big brands, materials and solid products, in addition, the use of external transformers is also a good solution.   

Stray electromagnetic interference is more common, speaker wire, frequency divider, wireless equipment or computer host will become a source of interference. Will the main speaker in the allowable conditions as far as possible from the computer host, and reduce the surrounding wireless equipment.

Mechanical noise is unique to the active speaker. Power transformers in the course of the work, the magnetic field caused by the vibration of the core will produce mechanical noise, which is similar to the sound of the light emitted by the ballast. The best way to prevent the noise is to choose good quality products. In addition, we can install rubber damping layer between the transformer and the fixed plate.

Another point should be noted that if the use of a long time, the metal brush and the film between the film will be due to the accumulation of dust and wear and other problems caused by bad contact, when the rotation will produce noise. If the speaker screw is not tightened, the inverted tube processing is not in place, in the complex music, also can produce mechanical noise.

The thermal noise can be reduced by replacing the low noise element or reducing the working load of the component.

In addition, some computer speakers, when the volume is too large, there will be noise. This situation is because the power amplifier output power may be smaller, can not avoid the music instantaneous peak signal caused by the large dynamic or due to the distortion caused by the horn overload.